A heat steam recovery device in salt production process

Abstract

This invention belongs to the field of heat steam recovery and provides a heat steam recovery device for salt production. The device includes a processing tank, with a filter box connected to the top side of the tank via a transition pipe. An external drain pipe is located at the bottom of the processing tank. A steam inlet pipe is fixedly installed on the processing tank, with one end of the steam inlet pipe extending into the tank and connected to a transfer pipe. A centrifugal dispersing mechanism is also installed on the processing tank, with one end connected to one end of the transfer pipe. The centrifugal dispersing mechanism is used to centrifuge and eject the steam from the transfer pipe. This invention first disperses the steam through the centrifugal dispersing mechanism, breaking up steam bubbles and causing droplets to fall out. Then, the steam is filtered through a hydrophobic and breathable membrane to block small salt crystals. Finally, the droplets and salt crystals are recovered, avoiding salt waste and preventing salt crystals from corroding equipment in the factory due to steam discharge.

Description

Technical Field

[0001] This invention belongs to the field of heat steam recovery, and particularly relates to a heat steam recovery device in the salt production process. Background Technology

[0002] Salt production refers to the manufacture of table salt (or industrial salt). The salt industry holds a significant position in the national economy and is an important component of it. Salt is a necessity for human life, a basic raw material for the chemical industry, and also has wide applications in other industrial sectors, agriculture, animal husbandry, and fisheries.

[0003] In the salt production process, brine containing salt is first collected, and then various impurity ions (such as calcium (Ca²⁺), magnesium (Mg²⁺), sulfate (SO₄²⁻) ions) are purified. After sedimentation and filtration, pure saturated sodium chloride brine is obtained. The pure brine is then sent to an evaporator (multi-effect vacuum evaporator), where the water evaporates rapidly under reduced pressure and heating conditions, causing sodium chloride to crystallize out. The crystallized salt slurry is then centrifuged to dehydrate, and then dried using a fluidized bed dryer. Finally, it is screened, iodized (if necessary), and packaged to obtain the finished refined salt.

[0004] When evaporating pure brine, the brine boils violently in the evaporation tank, producing a large number of bubbles. When these bubbles burst at the surface, they splash tiny brine droplets into the steam space above. As the water content decreases, the bubbles also carry small salt crystals with them. The high-speed steam carries these tiny, salt-rich droplets and salt crystals out of the evaporation chamber. If this part of the steam is directly discharged, the salt-rich droplets will fall down after the steam condenses. This will not only pollute and corrode the equipment inside the factory, but also waste salt. Summary of the Invention

[0005] The purpose of this invention is to provide a heat steam recovery device in the salt production process, which aims to solve the technical problem that direct steam emission in the prior art not only causes pollution and corrosion to the equipment, but also wastes salt.

[0006] This invention is implemented as follows: a heat steam recovery device in a salt production process includes a processing tank. The top side of the processing tank is connected to a filter box via a transition pipe. An external drain pipe is provided at the bottom of the processing tank. A steam inlet pipe is fixedly installed on the processing tank. One end of the steam inlet pipe, which extends into the processing tank, is connected to a transfer pipe. A centrifugal dispersing mechanism is also installed on the processing tank. One end of the centrifugal dispersing mechanism is connected to one end of the transfer pipe. The centrifugal dispersing mechanism is used to centrifuge and throw the steam in the transfer pipe, causing the steam to impact the inner wall of the processing tank. Then, the steam bubbles burst, breaking into countless small steam bubbles. The liquid droplets and larger salt crystals inside the steam bubbles slide down the inner wall of the processing tank to the bottom of the processing tank. A gas-gathering hood is fixedly installed inside the filter box. One end of the gas-gathering hood is connected to a steam outlet pipe, one end of which extends out of the filter box. The other end of the gas-gathering hood is equipped with a hydrophobic and breathable membrane. The hydrophobic and breathable membrane allows water vapor to pass through but prevents small salt crystals from passing through, thus blocking the salt crystals on the side of the hydrophobic and breathable membrane. Pure steam is discharged from the steam outlet pipe. A return liquid pipe is connected to the side of the filter box near the treatment tank. One end of the return liquid pipe is connected to the treatment tank. An inclined guide plate is fixedly connected to the bottom of the gas-gathering hood. One end of the guide plate extends below the end of the return liquid pipe, allowing the salt crystals on the hydrophobic and breathable membrane to slide down the guide plate into the return liquid pipe and eventually into the treatment tank. The droplets and salt crystals in the treatment tank can then be discharged from the external drain pipe for recycling, avoiding salt waste and preventing salt crystals from corroding equipment in the factory due to being discharged with steam.

[0007] Further technical solution: The centrifugal dispersing mechanism includes a centrifugal tube rotatably mounted on the top of the transfer tube and connected to the transfer tube. Multiple ejection tubes are provided on the top side of the centrifugal tube. The multiple ejection tubes are evenly distributed around the axis of the centrifugal tube. A connecting pipe is fixedly connected to the top of the centrifugal tube. The connecting pipe is rotatably mounted on the processing tank. A second servo motor is fixedly mounted on the top of the processing tank. A transmission pair is connected between the second servo motor and the connecting pipe.

[0008] A further technical solution: The bottom of the transfer pipe is provided with a slag discharge hole, so that salt crystals can be discharged from the slag discharge hole; To prevent steam from leaking from the slag discharge hole and reduce the centrifugal dispersion effect of the centrifugal dispersion mechanism on the steam, a sealing mechanism is also installed on the treatment tank. The sealing mechanism includes a fixed frame fixedly installed on the top of the treatment tank. A second adjusting screw is threadedly connected to the fixed frame. A second connecting rod is fixedly connected to the bottom of the second adjusting screw. A sealing ball is fixedly connected to one end of the second connecting rod, which passes through the connecting pipe, the discharge pipe and the transfer pipe in sequence. Initially, the sealing ball seals the slag discharge hole.

[0009] Further technical solution: The filter box is also equipped with an anti-clogging mechanism, which includes a water storage tank installed inside the filter box. Several water spray pipes are connected to the side of the water storage tank. The end of the water spray pipe is provided with a water spray head. The water spray head contacts the surface of the hydrophobic and breathable membrane. Water spray holes are opened on the side of the water spray head. A water replenishment tank is installed on the top of the filter box. Water is contained inside the water replenishment tank. A water replenishment pipe is connected to the bottom of the water replenishment tank. One end of the water replenishment pipe that extends into the filter box is connected to a flexible hose. One end of the flexible hose is connected to the water storage tank. The anti-clogging mechanism also includes a pressure switch, one end of which extends into the interior of the water storage tank and seals all the spray pipes. When the hydrophobic and breathable membrane is blocked, the air pressure inside the filter box increases, thereby causing the pressure switch to release the seal on the spray pipes, allowing water in the water storage tank to flow from the spray pipes to the surface of the hydrophobic and breathable membrane. When salt crystals encounter water, they dissolve in the water and flow into the treatment tank with the water, thus solving the problem of the hydrophobic and breathable membrane being blocked. The pressure switch also prevents water from continuously flowing into the treatment tank, avoiding the need for frequent water discharge from the treatment tank.

[0010] Further technical solution: The pressure switch includes a baffle plate that is slidably installed inside the water storage tank. The baffle plate has several water passage holes that are adapted to the watering pipe. One end of the baffle plate is connected to the water storage tank by a compression spring. Initially, the water passage holes are not connected to the watering pipe. The other end of the baffle plate extends out of the water storage tank and is fixedly connected to a squeezing plate.

[0011] Further technical solution: The anti-clogging mechanism also includes a drive mechanism, the drive mechanism includes a first servo motor fixedly installed on the side of the filter box, the output shaft of the first servo motor is fixedly connected to a reciprocating lead screw, the water storage tank is slidably installed inside the filter box, and one end of the reciprocating lead screw is threadedly connected to the water storage tank; To enable the first servo motor to drive the water storage tank to move in a timely manner, a flow sensor is installed on the water supply pipe, and the flow sensor is electrically connected to the first servo motor.

[0012] Further technical solution: The pressure switch also includes an adjustment plate, which is slidably installed inside the water storage tank, and one end of the compression spring is connected to the adjustment plate. A first adjustment screw is rotatably installed on the side of the adjustment plate, and the first adjustment screw is threadedly connected to the water storage tank. Rotating the first adjusting screw adjusts its position, thereby adjusting the initial elasticity of the compression spring and restoring it to its original value. For ease of adjustment, one end of the first adjusting screw needs to extend to the outside of the filter box. To ensure the airtightness of the filter box and prevent steam leakage, the pressure switch also includes an adjusting rod rotatably mounted on the filter box, with one end of the first adjusting screw slidably mounted to the adjusting rod.

[0013] Further technical solution: The interior of the treatment tank is provided with an arc-shaped baffle, and the bottom of the arc-shaped baffle is provided with an inner drain pipe. The bottom of the inner drain pipe is sealed and an inner drain port is provided. The arc-shaped baffle and the bottom of the treatment tank form a transition cavity. The bottom of the outer drain pipe is sealed and an outer drain port is provided. The outer drain port and the inner drain port are staggered in the horizontal plane. A sealing assembly is also installed on the external drain pipe. One end of the sealing assembly extends into the transition cavity and can block the internal drain port. The other end of the sealing assembly can block the external drain port, thereby achieving a seal between the sealing assembly and the treatment tank. When cleaning is required, the seal on the internal drain port is first released. At this time, the external drain port is still blocked, and the liquid water above the arc-shaped baffle flows from the internal drain port into the transition cavity. Then, the seal on the external drain port is released again. At this time, the internal drain port is blocked, and the water in the transition cavity flows out from the external drain port. At the same time, the sealing assembly seals the internal drain pipe to prevent the leakage of steam in the treatment tank.

[0014] A further technical solution: The sealing assembly includes an outer plug cap rotatably mounted on the outer drain pipe. The top of the outer plug cap is connected to an inner plug cap via a first connecting rod. The inner plug cap is rotatably mounted on the end of the inner drain pipe. The bottom of the inner plug cap has an inner drain hole adapted to the inner drain port. The bottom of the outer plug cap has an outer drain hole adapted to the outer drain port. A switch rod is also rotatably mounted on the side of the outer drain pipe. An adjusting bevel gear is fixedly mounted on the switch rod. A driven bevel gear is fixedly mounted on the outer plug cap. The driven bevel gear and the adjusting bevel gear are meshed together.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. In this invention, the steam is first dispersed by a centrifugal dispersing mechanism to break the steam bubbles and drop the liquid droplets. Then, the steam is filtered by a hydrophobic and breathable membrane to block small salt crystal particles. Finally, the liquid droplets and salt crystals are recovered, which avoids the waste of salt and also prevents the salt crystals from being discharged with the steam and causing corrosion to the equipment in the factory. 2. In this invention, a slag discharge hole is opened at the bottom of the transfer tube, which allows droplets and salt crystals to be discharged from the slag discharge hole, avoiding their residue in the transfer tube and causing salt waste. At the same time, during normal operation, the slag discharge hole is sealed by a sealing mechanism to prevent steam leakage. 3. By setting an anti-clogging mechanism, the salt crystals blocked on the surface of the hydrophobic and breathable membrane can be dissolved in water and flow into the treatment tank with the water, thereby solving the problem of clogging of the hydrophobic and breathable membrane and extending the service life of the hydrophobic and breathable membrane. 4. In this invention, by setting a pressure switch, the pressure switch can automatically detect the gas pressure in the filter box and automatically open the watering pipe for cleaning, preventing the hydrophobic and breathable membrane from being blocked. This process does not require manual operation and is simpler to use. 5. The present invention, by setting an adjusting plate, a compression spring and a first adjusting screw, can adjust the position of the first adjusting screw, thereby adjusting the initial elasticity of the compression spring and restoring the initial elasticity of the compression spring to its original value. This solves the problem that as the usage time increases, the elasticity of the compression spring weakens, leading to an increase in the frequency of water spraying from the irrigation pipe, which in turn leads to an increase in the amount of water flowing into the treatment tank, thus increasing the frequency of cleaning the treatment tank. 6. This invention, by setting up an arc-shaped baffle, an inner drain pipe, and a sealing assembly, allows for the following process during cleaning: First, the inner drain hole and the inner drain outlet are connected, while the outer drain hole and the outer drain outlet are not connected. Water within the arc-shaped baffle then flows into the transition chamber. Next, the inner drain hole and the inner drain outlet are disconnected, and the outer drain hole and the outer drain outlet are connected. Water in the transition chamber then flows out from the outer drain outlet, thus achieving the cleaning and recovery of droplets and salt crystals within the treatment tank. Furthermore, this process avoids the leakage of steam from the treatment tank and prevents the waste of salt. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a schematic diagram of the internal structure of the processing tank in this invention.

[0018] Figure 3 In this invention Figure 2 Enlarged diagram of point A in the middle.

[0019] Figure 4 This is a schematic diagram of a partial cross-sectional structure of the processing tank in this invention, viewed from below.

[0020] Figure 5 This is a schematic diagram of the sealing tube assembly in this invention.

[0021] Figure 6 This is a schematic diagram of the side cross-section of the filter box in this invention.

[0022] Figure 7 In this invention Figure 6 Enlarged diagram of point B in the middle.

[0023] Figure 8This is a bottom-view cross-sectional diagram of the anti-blocking mechanism in this invention.

[0024] Figure 9 In this invention Figure 8 Enlarged structural diagram at point C.

[0025] In the attached diagram: 1. Steam inlet pipe; 2. Processing tank; 3. External drain pipe; 31. External drain port; 4. Sealing assembly; 41. Inner plug cap; 42. First connecting rod; 43. Adjusting bevel gear; 44. Driven bevel gear; 45. Switch rod; 46. External plug cap; 47. Inner drain hole; 48. External drain hole; 5. Return pipe; 6. Filter box; 7. Steam outlet pipe; 8. Anti-clogging mechanism; 81. Water supply tank; 82. Water storage tank; 83. Sprinkler pipe; 84. First servo motor; 85. Adjusting rod; 86. Reciprocating screw; 87. First adjusting screw; 88. Extrusion plate; 89. Water baffle plate; 810. Water supply pipe; 811. Flow sensor; 812. Hose; 813. Spray ball head; 814. Water passage hole; 815. Compression spring; 816. Adjusting plate; 817. Spray hole; 9. Centrifugal dispersing mechanism; 91. Centrifuge tube; 92. Discharge tube; 93. Connecting tube; 94. Second servo motor; 95. Transmission pair; 10. Sealing mechanism; 101. Second adjusting screw; 102. Fixing frame; 103. Second connecting rod; 104. Sealing ball; 11. Transition tube; 12. Arc-shaped partition; 13. Transfer tube; 14. Slag discharge hole; 15. Inner drain pipe; 151. Inner drain port; 16. Transition cavity; 17. Hydrophobic and breathable membrane; 18. Gas gathering hood; 19. Guide plate. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0027] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0028] like Figures 1-9As shown, this invention provides a heat recovery device for salt production, including a processing tank 2. The top side of the processing tank 2 is connected to a filter box 6 via a transition pipe 11. An external drain pipe 3 is provided at the bottom of the processing tank 2. A steam inlet pipe 1 is fixedly installed on the processing tank 2. One end of the steam inlet pipe 1, which extends into the processing tank 2, is connected to a transfer pipe 13. A centrifugal dispersing mechanism 9 is also installed on the processing tank 2. One end of the centrifugal dispersing mechanism 9 is connected to one end of the transfer pipe 13. The centrifugal dispersing mechanism 9 is used to centrifugally throw out the steam in the transfer pipe 13 and make the steam impact the inner wall of the processing tank 2. Then the steam bubble breaks, splitting into countless small steam bubbles. Then the liquid droplets and larger salt crystals inside the steam bubble slide down the inner wall of the processing tank 2 to the bottom of the processing tank 2. A gas-gathering hood 18 is fixedly installed inside the filter box 6. One end of the gas-gathering hood 18 is connected to a steam outlet pipe 7, one end of which extends out of the filter box 6. The other end of the gas-gathering hood 18 is provided with a hydrophobic and breathable membrane 17. The hydrophobic and breathable membrane 17 allows water vapor to pass through but prevents small salt crystals from passing through, thus blocking the salt crystals on the side of the hydrophobic and breathable membrane 17. Pure steam is discharged from the steam outlet pipe 7. A return pipe 5 is connected to the side of the filter box 6 near the treatment tank 2. One end is connected to the treatment tank 2. The bottom of the gas-gathering hood 18 is fixedly connected to an inclined guide plate 19. One end of the guide plate 19 extends below the end of the return pipe 5, so that the salt crystals on the hydrophobic and breathable membrane 17 can slide down the guide plate 19 into the return pipe 5 and finally fall into the treatment tank 2. Then the droplets and salt crystals in the treatment tank 2 can be discharged from the external drain pipe 3 for recycling, avoiding the waste of salt. At the same time, it also avoids the salt crystals from being discharged with the steam and causing corrosion to the equipment in the factory.

[0029] Specifically, the steam inlet pipe 1 is connected to the evaporator. The water vapor evaporated from the evaporator enters the transfer pipe 13 through the steam inlet pipe 1 and is centrifuged and thrown out by the centrifugal dispersing mechanism 9. The steam impacts the inner wall of the treatment tank 2, causing the steam bubbles to break. Then, the droplets in the steam bubbles slide down the inner wall of the treatment tank 2 to the bottom of the treatment tank 2. The broken steam enters the filter box 6 through the transition pipe 11. The hydrophobic and breathable membrane 17 filters the steam. Small salt crystal particles are blocked on the surface of the hydrophobic and breathable membrane 17 and then slide down along the guide plate 19 into the return pipe 5 and finally fall into the treatment tank 2. The droplets and salt crystals in the treatment tank 2 can then be discharged from the external drain pipe 3 for recycling, avoiding the waste of salt. At the same time, it also prevents the salt crystals from corroding the equipment in the factory due to being discharged with the steam.

[0030] The present invention provides a heat recovery device for salt production process. In this embodiment, the centrifugal dispersing mechanism 9 includes a centrifugal tube 91 rotatably mounted on the top of the transfer tube 13 and connected to the transfer tube 13. Multiple ejection tubes 92 are provided on the top side of the centrifugal tube 91. The multiple ejection tubes 92 are evenly distributed around the axis of the centrifugal tube 91. A connecting tube 93 is fixedly connected to the top of the centrifugal tube 91. The connecting tube 93 is rotatably mounted on the processing tank 2. A second servo motor 94 is fixedly mounted on the top of the processing tank 2. A transmission pair 95 is connected between the second servo motor 94 and the connecting tube 93.

[0031] Specifically, the second servo motor 94 is started, and the second servo motor 94 drives the connecting pipe 93 to rotate through the transmission pair 95. The connecting pipe 93 drives the centrifuge tube 91 to rotate. When the steam in the transfer pipe 13 rushes out from the ejector pipe 92, the centrifuge tube 91 centrifuges and accelerates the steam, causing the steam to fly out with a large acceleration. Then the steam hits the inner wall of the processing tank 2 and breaks the steam bubbles.

[0032] The present invention provides a heat recovery device for salt production process. During the process of steam flowing from steam inlet pipe 1 into transfer pipe 13, since the axis of steam inlet pipe 1 is perpendicular to the axis of transfer pipe 13, the steam will first hit the inner wall of transfer pipe 13, some steam bubbles will be broken, and then some droplets and salt crystals will fall out. The fallen droplets and salt crystals will remain inside the transfer pipe 13, causing salt waste. Therefore, in this embodiment, a slag discharge hole 14 is provided at the bottom of the transfer pipe 13 so that droplets and salt crystals can be discharged from the slag discharge hole 14. To prevent steam from leaking from the slag discharge hole 14 and reduce the centrifugal dispersion effect of the centrifugal dispersion mechanism 9 on the steam, a sealing mechanism 10 is also installed on the treatment tank 2. The sealing mechanism 10 includes a fixed frame 102 fixedly installed on the top of the treatment tank 2. A second adjusting screw 101 is threadedly connected to the fixed frame 102. A second connecting rod 103 is fixedly connected to the bottom of the second adjusting screw 101. One end of the second connecting rod 103 passes through the connecting pipe 93, the discharge pipe 92 and the adapter pipe 13 in sequence and is fixedly connected to a sealing ball 104. Initially, the sealing ball 104 seals the slag discharge hole 14.

[0033] Specifically, the bottom of the transfer pipe 13 is set to a hemispherical shape, so that the droplets and salt crystals in the transfer pipe 13 can converge at the slag discharge hole 14, so that all the droplets and salt crystals in the transfer pipe 13 can be discharged.

[0034] During normal operation, the sealing ball 104 seals the slag discharge hole 14 to prevent steam from leaking from the slag discharge hole 14. When cleaning the droplets and salt crystals in the transfer pipe 13, the second adjusting screw 101 is rotated. The second adjusting screw 101 drives the sealing ball 104 to descend through the second connecting rod 103, releasing the sealing ball 104 from the slag discharge hole 14. Then, the droplets and salt crystals in the transfer pipe 13 slide from the periphery of the sealing ball 104 to the bottom of the treatment tank 2. After all the droplets and salt crystals in the transfer pipe 13 have slid out, the second adjusting screw 101 is rotated in the opposite direction so that the sealing ball 104 re-seals the slag discharge hole 14.

[0035] When cleaning the droplets and salt crystals in the transfer pipe 13, some vapor will leak from the gap between the sealing ball 104 and the slag discharge hole 14. However, the leaked vapor will be filtered by the hydrophobic and breathable membrane 17, and the leakage amount is very small because the time for cleaning the salt crystals is very short. Therefore, the impact of this part of the vapor leakage is not significant.

[0036] This invention provides a steam recovery device for salt production. After prolonged filtration of steam by the hydrophobic and breathable membrane 17, small salt crystals can clog the surface of the membrane, reducing the steam flow rate and increasing the pressure inside the filter box 6. This can exacerbate damage to the membrane 17. Therefore, in this embodiment, an anti-clogging mechanism 8 is also installed on the filter box 6. The anti-clogging mechanism 8 includes a water storage tank 82 installed inside the filter box 6, and the side of the water storage tank 82 is connected to... Several watering pipes 83 are provided, and each watering pipe 83 is provided with a water spray ball head 813 at its end. The water spray ball head 813 is in contact with the surface of the hydrophobic and breathable membrane 17. The side of the water spray ball head 813 is provided with a water spray hole 817. A water supply tank 81 is installed on the top of the filter box 6. The water supply tank 81 is filled with water. The bottom of the water supply tank 81 is connected to a water supply pipe 810. One end of the water supply pipe 810 extends into the filter box 6 and is connected to a flexible hose 812. One end of the flexible hose 812 is connected to a water storage tank 82. The anti-clogging mechanism 8 also includes a pressure switch. One end of the pressure switch extends into the interior of the water storage tank 82 and blocks all the spray pipes 83. When the hydrophobic and breathable membrane 17 is blocked, the air pressure in the filter box 6 increases, thereby releasing the pressure switch from blocking the spray pipes 83. This allows water in the water storage tank 82 to flow from the spray pipes 83 to the surface of the hydrophobic and breathable membrane 17. When the salt crystals encounter water, they dissolve in the water and flow into the treatment tank 2 with the water, thus solving the problem of the hydrophobic and breathable membrane 17 being blocked. The pressure switch also prevents water from continuously flowing into the treatment tank 2, avoiding the need for frequent water discharge from the treatment tank 2.

[0037] Specifically, the water temperature is 93 degrees Celsius for the connecting pipe and 8 degrees Celsius for the centrifugal dispersing mechanism 9 and the anti-blocking mechanism, which reduces the cooling of the steam and prevents the steam from cooling into a liquid state, so that the steam can be smoothly discharged from the steam outlet pipe 7.

[0038] The present invention provides a heat steam recovery device in the salt production process. In this embodiment, the pressure switch includes a baffle plate 89 slidably installed inside the water storage tank 82. The baffle plate 89 has a plurality of water passage holes 814 adapted to the irrigation pipe 83. One end of the baffle plate 89 is connected to the water storage tank 82 by a compression spring 815. Initially, the water passage holes 814 are not connected to the irrigation pipe 83. The other end of the baffle plate 89 extends out of the water storage tank 82 and is fixedly connected to a squeezing plate 88.

[0039] Specifically, when the hydrophobic and breathable membrane 17 is blocked, the air pressure inside the filter box 6 will increase. When the pushing force of the gas inside the filter box 6 on the extrusion plate 88 is greater than the elastic force of the compression spring 815, the gas will push the extrusion plate 88 and the baffle plate 89 to move, thereby connecting the water passage hole 814 with the spray pipe 83. The water in the water storage tank 82 enters the spray pipe 83 through the water passage hole 814 and is then sprayed onto the surface of the hydrophobic and breathable membrane 17 from the spray hole 817. When all the salt crystals on the surface of the hydrophobic and breathable membrane 17 dissolve into the water and are carried away with the water flow, the steam flow rate through the hydrophobic and breathable membrane 17 increases, the air pressure inside the filter box 6 decreases, and the compression spring 815 pushes the baffle plate 89 back to its original position, causing the baffle plate 89 to block the spray pipe 83 again, thus preventing water leakage from the water storage tank 82, avoiding excess water from blocking the steam, increasing the steam emission, and avoiding frequent treatment of the liquid water in the treatment tank 2.

[0040] The present invention provides a heat recovery device for salt production process. Due to the gap between two adjacent pouring pipes 83, the water flowing out from the pouring pipe 83 can only flow in the vertical direction along the axis of the pouring pipe 83 and cannot flow in other directions. As a result, the salt crystals on the hydrophobic and breathable membrane 17 cannot be completely removed, which reduces the anti-clogging effect of the anti-clogging mechanism 8. Therefore, in this embodiment, the anti-clogging mechanism 8 also includes a driving mechanism. The driving mechanism includes a first servo motor 84 fixedly installed on the side of the filter box 6. The output shaft of the first servo motor 84 is fixedly connected to a reciprocating screw 86. The water storage tank 82 is slidably installed inside the filter box 6. One end of the reciprocating screw 86 is threadedly connected to the water storage tank 82. In order to enable the first servo motor 84 to drive the water storage tank 82 to move in a timely manner, a flow sensor 811 is installed on the water supply pipe 810, and the flow sensor 811 is electrically connected to the first servo motor 84.

[0041] Specifically, after the water in the water storage tank 82 is sprayed onto the hydrophobic and breathable membrane 17 through the water spraying pipe 83, the water in the water storage tank 82 will decrease. Then, the water in the water replenishment tank 81 will flow into the water storage tank 82 through the water replenishment pipe 810 and the hose 812. When the flow sensor 811 detects water flow in the water replenishment pipe 810, the first servo motor 84 is started. The first servo motor 84 drives the water storage tank 82 to reciprocate through the reciprocating screw 86, which in turn drives all the water spraying pipes 83 to reciprocate. This allows the water sprayed from all the water spraying pipes 83 to cover the entire hydrophobic and breathable membrane 17, thereby treating the salt crystals on the entire hydrophobic and breathable membrane 17 and improving the anti-clogging effect of the anti-clogging mechanism 8.

[0042] The present invention provides a heat steam recovery device in the salt production process. After long-term use, the elasticity of the compression spring 815 will weaken, which will increase the frequency of water spraying from the irrigation pipe 83, and thus increase the amount of water flowing into the treatment tank 2. This will increase the frequency of cleaning the treatment tank 2 and increase the workload of the staff. Therefore, in this embodiment, the pressure switch also includes an adjustment plate 816. The adjustment plate 816 is slidably installed inside the water storage tank 82, and one end of the compression spring 815 is connected to the adjustment plate 816. A first adjustment screw 87 is rotatably installed on the side of the adjustment plate 816 and is threadedly connected to the water storage tank 82. Rotating the first adjusting screw 87 adjusts the position of the first adjusting screw 87, thereby adjusting the initial elasticity of the compression spring 815 and restoring the initial elasticity of the compression spring 815 to its original value. To facilitate adjustment, one end of the first adjusting screw 87 needs to extend to the outside of the filter box 6. To ensure the airtightness of the filter box 6 and prevent steam leakage, the pressure switch also includes an adjusting rod 85 rotatably mounted on the filter box 6, with one end of the first adjusting screw 87 slidably mounted on the adjusting rod 85.

[0043] Specifically, when the water storage tank 82 reciprocates, the first adjusting screw 87 moves along the axis of the adjusting rod 85. When adjusting the adjusting plate 816, the adjusting rod 85 is rotated, which drives the first adjusting screw 87 to rotate. The first adjusting screw 87 then drives the adjusting plate 816 to move, thereby adjusting the position of the adjusting plate 816. Compared to having the first adjusting screw 87 directly slide and rotate on the filter box 6, the structure in which the adjusting rod 85 is only rotated has better sealing performance.

[0044] The present invention provides a heat recovery device for salt production process. When cleaning the liquid water in the treatment tank 2, it is necessary to open the external drain pipe 3 to allow the water to flow out from the external drain pipe 3. However, at the same time, steam will also float out from the external drain pipe 3, causing some salt waste. However, if the machine is stopped for cleaning, it will cause a decrease in production efficiency. Therefore, in this embodiment, the treatment tank 2 is provided with an arc-shaped partition 12. The bottom of the arc-shaped partition 12 is provided with an internal drain pipe 15. The bottom of the internal drain pipe 15 is sealed and an internal drain port 151 is provided. The arc-shaped partition 12 and the bottom of the treatment tank 2 form a transition cavity 16. The bottom of the external drain pipe 3 is sealed and an external drain port 31 is provided. The external drain port 31 and the internal drain port 151 are staggered in the horizontal plane. A sealing assembly 4 is also installed on the external drain pipe 3. One end of the sealing assembly 4 extends into the transition cavity 16 and can block the internal drain port 151. The other end of the sealing assembly 4 can block the external drain port 31, thereby achieving the sealing of the treatment tank 2 by the sealing assembly 4. When cleaning is required, the blockage of the internal drain port 151 is first released. At this time, the external drain port 31 is still blocked, and the liquid water above the arc-shaped baffle 12 flows from the internal drain port 151 into the transition cavity 16. Then the blockage of the external drain port 31 is released again. At this time, the internal drain port 151 is blocked, and the water in the transition cavity 16 will flow out from the external drain port 31. At the same time, the sealing assembly 4 seals the internal drain pipe 15 to prevent the leakage of steam in the treatment tank 2.

[0045] In addition, the opening connecting the return pipe 5 to the treatment tank 2 is located above the arc-shaped baffle 12, so that water gathers on the arc-shaped baffle 12. The droplets and salt crystals that slide down inside the treatment tank 2 will dissolve in the water. During cleaning, all the droplets and salt crystals inside the treatment tank 2 can be cleaned out and recycled.

[0046] The present invention provides a heat recovery device for salt production process. In this embodiment, the sealing pipe assembly 4 includes an outer plug 46 rotatably mounted on the outer drain pipe 3. The top of the outer plug 46 is connected to an inner plug 41 via a first connecting rod 42. The inner plug 41 is rotatably mounted on the end of the inner drain pipe 15. The bottom of the inner plug 41 is provided with an inner drain hole 47 adapted to the inner drain port 151. The bottom of the outer plug 46 is provided with an outer drain hole 48 adapted to the outer drain port 31. A switch rod 45 is also rotatably mounted on the side of the outer drain pipe 3. An adjusting bevel gear 43 is fixedly mounted on the switch rod 45. A driven bevel gear 44 is fixedly mounted on the outer plug 46. The driven bevel gear 44 and the adjusting bevel gear 43 are meshed together.

[0047] Specifically, rotating the switch lever 45 causes the outer plug 46 to rotate via adjusting the bevel gear 43 and driven bevel gear 44. The outer plug 46 then causes the inner plug 41 to rotate via the first connecting rod 42. During cleaning, the inner drain hole 47 is first connected to the inner drain port 151, while the outer drain hole 48 and the outer drain port 31 are not connected. This allows the water in the arc-shaped baffle 12 to flow into the transition chamber 16. Then, the inner drain hole 47 and the inner drain port 151 are disconnected, and the outer drain hole 48 and the outer drain port 31 are connected. The water in the transition chamber 16 then flows out from the outer drain port 31, thus achieving the cleaning and recycling of droplets and salt crystals in the treatment tank 2. In this process, leakage of steam in the treatment tank 2 is avoided, and salt waste is prevented.

[0048] Working principle: Water vapor evaporated from the evaporator enters the transfer pipe 13 through the steam inlet pipe 1. The water vapor surges to the top of the centrifuge tube 91, activating the second servo motor 94. The second servo motor 94 drives the centrifuge tube 91 to rotate, and the steam is centrifuged and thrown out by the centrifugal dispersing mechanism 9, impacting the inner wall of the processing tank 2. The steam bubbles break, and the droplets and salt crystals inside the steam bubbles fall out. They slide down the inner wall of the processing tank 2 to the top of the arc-shaped baffle 12, while the broken steam enters the filter box 6 through the transition pipe 11. The hydrophobic and breathable membrane 17 filters the steam, and the salt crystals are blocked in the hydrophobic membrane. When the hydrophobic and breathable membrane 17 is blocked, the air pressure inside the filter box 6 increases, and the gas pushes the extrusion plate 88 and the baffle plate 89 to move, thereby connecting the water passage hole 814 with the irrigation pipe 83. The water in the water storage tank 82 enters the irrigation pipe 83 through the water passage hole 814 and is then sprayed onto the surface of the hydrophobic and breathable membrane 17 from the spray hole 817. At the same time, the flow sensor 811 detects the water flow and starts the first servo motor 84. The first servo motor 84 drives the water storage tank 82 to reciprocate, so that the water sprayed from the spray hole 817 can cover the entire surface of the hydrophobic and breathable membrane 17. When the salt crystals on the surface of the hydrophobic and breathable membrane 17 come into contact with water, they will all dissolve into the water. The salt water will flow into the treatment tank 2 along the guide plate 19 and the return pipe 5 and converge at the top of the arc-shaped baffle 12. The original droplets and salt crystals in the arc-shaped baffle 12 will also dissolve into the water. When there is a large amount of liquid water in the treatment tank 2 and cleaning is required, turn the switch rod 45. The switch rod 45 drives the outer plug 46 and the inner plug 41 to rotate. First, the inner drain hole 47 is connected to the inner drain port 151, while the outer drain hole 48 and the outer drain port 31 are not connected. Then, the water in the arc-shaped baffle 12 will flow into the transition chamber 16. Then, the inner drain hole 47 and the inner drain port 151 are disconnected, and the outer drain hole 48 and the outer drain port 31 are connected. The water in the transition chamber 16 will flow out from the outer drain port 31, thereby achieving the cleaning and recycling of droplets and salt crystals in the treatment tank 2 and the filter box 6.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A heat steam recovery device for salt production, comprising a processing tank, characterized in that, The top side of the treatment tank is connected to a filter box via a transition pipe. An external drain pipe is provided at the bottom of the treatment tank. A steam inlet pipe is fixedly installed on the treatment tank. One end of the steam inlet pipe that extends into the interior of the treatment tank is connected to a transfer pipe. A centrifugal dispersing mechanism is also installed on the treatment tank. One end of the centrifugal dispersing mechanism is connected to one end of the transfer pipe. The centrifugal dispersing mechanism is used to centrifuge and throw out the steam in the transfer pipe. A gas-gathering hood is fixedly installed inside the filter box. One end of the gas-gathering hood is connected to a steam outlet pipe, and one end of the steam outlet pipe extends out of the filter box. A hydrophobic and breathable membrane is provided at the other end of the gas-gathering hood. A return liquid pipe is connected to the side of the filter box near the treatment tank. One end of the return liquid pipe is connected to the treatment tank. An inclined guide plate is fixedly connected to the bottom of the gas-gathering hood, and one end of the guide plate extends below the end of the return liquid pipe. The filter box is also equipped with an anti-clogging mechanism, which includes a pressure switch. The pressure switch includes a baffle plate that is slidably installed inside the water storage tank. The baffle plate has several water passage holes that are adapted to the watering pipe. One end of the baffle plate is connected to the water storage tank by a compression spring. Initially, the water passage holes are not connected to the watering pipe. The other end of the baffle plate extends out of the water storage tank and is fixedly connected to a squeezing plate. The pressure switch also includes an adjustment plate, which is slidably installed inside the water storage tank, and one end of the compression spring is connected to the adjustment plate. A first adjustment screw is rotatably installed on the side of the adjustment plate, and the first adjustment screw is threadedly connected to the water storage tank. The pressure switch also includes an adjusting rod rotatably mounted on the filter box, and one end of the first adjusting screw is slidably mounted with the adjusting rod. The processing tank is equipped with an arc-shaped baffle inside. An inner drain pipe is provided at the bottom of the arc-shaped baffle. The bottom of the inner drain pipe is sealed and an inner drain port is provided. The arc-shaped baffle and the bottom of the processing tank form a transition cavity. The bottom of the outer drain pipe is sealed and an outer drain port is provided. The outer drain port and the inner drain port are staggered in the horizontal plane. The external drain pipe is also equipped with a sealing assembly. One end of the sealing assembly extends into the transition cavity and blocks the internal drain port, while the other end of the sealing assembly can block the external drain port.

2. The heat recovery device for salt production process according to claim 1, characterized in that, The centrifugal dispersing mechanism includes a centrifugal tube rotatably mounted on the top of a transfer tube and connected to the transfer tube. Multiple ejection tubes are provided on the top side of the centrifugal tube and are evenly distributed around the axis of the centrifugal tube. A connecting pipe is fixedly connected to the top of the centrifugal tube and is rotatably mounted on a processing tank. A second servo motor is fixedly mounted on the top of the processing tank, and a transmission pair is connected between the second servo motor and the connecting pipe.

3. The heat recovery device for salt production process according to claim 1 or 2, characterized in that, The bottom of the transfer pipe is provided with a slag discharge hole; The treatment tank is also equipped with a sealing mechanism, which includes a fixed frame fixedly installed on the top of the treatment tank. A second adjusting screw is threadedly connected to the fixed frame. A second connecting rod is fixedly connected to the bottom of the second adjusting screw. The second connecting rod passes through the centrifugal dispersing mechanism and the transfer pipe in sequence, and a sealing ball is fixedly connected to one end. Initially, the sealing ball seals the slag discharge hole.

4. The heat steam recovery device in the salt production process according to claim 1, characterized in that, The anti-clogging mechanism includes a water storage tank installed inside the filter box. Several water spray pipes are connected to the side of the water storage tank. The end of each water spray pipe is equipped with a water spray head. The water spray head contacts the surface of the hydrophobic and breathable membrane. Water spray holes are opened on the side of the water spray head. A water replenishment tank is installed on the top of the filter box. The water replenishment tank is filled with water. A water replenishment pipe is connected to the bottom of the water replenishment tank. One end of the water replenishment pipe that extends into the filter box is connected to a flexible hose. One end of the flexible hose is connected to the water storage tank. One end of the pressure switch extends into the interior of the water storage tank and seals all the watering pipes. When the hydrophobic and breathable membrane is blocked, the pressure switch releases the seal on the watering pipes.

5. The heat recovery device for salt production process according to claim 4, characterized in that, The anti-clogging mechanism also includes a drive mechanism, which includes a first servo motor fixedly installed on the side of the filter box. The output shaft of the first servo motor is fixedly connected to a reciprocating lead screw. The water storage tank is slidably installed inside the filter box. One end of the reciprocating lead screw is threadedly connected to the water storage tank. A flow sensor is installed on the water supply pipe, and the flow sensor is electrically connected to the first servo motor.

6. The heat recovery device for salt production process according to claim 1, characterized in that, The sealing assembly includes an outer plug cap rotatably mounted on an external drain pipe. An inner plug cap is connected to the top of the outer plug cap via a first connecting rod. The inner plug cap is rotatably mounted on the end of the internal drain pipe. An internal drain hole adapted to the internal drain outlet is opened at the bottom of the inner plug cap. An external drain hole adapted to the external drain outlet is opened at the bottom of the outer plug cap. A switch rod is also rotatably mounted on the side of the external drain pipe. An adjusting bevel gear is fixedly mounted on the switch rod. A driven bevel gear is fixedly mounted on the outer plug cap. The driven bevel gear and the adjusting bevel gear are meshed together.

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